Aim: to compare the effect of multiple usage and surface coarseness of diamond
burs on marginal microleakage of cervical resin composite restorations.
Materials and methods: sixty extracted premolars without caries were chosen. The
sample was rand
omly divided into three groups: n1=n2=n3=20. Group(1): class v cavities
were prepared using super coarse diamond burs, group(2): prepared by coarse diamond
burs, whereas group)3(: prepared by medium coarse diamond burs. All cavities were
restored by resin composite, then The teeth were thermocycled and immersedIn5%solution
of methylene blue dye for 12hours.Then the teeth were sectioned vertically, Dye
penetration was evaluated using a 10X stereomicroscope at the occlusal and gingival
margins. Data were collected and statistical analysis was conducted.
Results: The results showed that the multiple use of super coarse diamond burs
caused no significantly statistically affect on occlusal and gingival microleakage (P>0.05).
However, the multiple use of coarse and medium diamond burs caused significantly
statistically affect on gingival marginal microleakage (P<0.05).
The Aim: To evaluate practioner’s knowledge on dental bur selection, its usage, sterilization procedures undertaken and the method of disposal of dental burs. Materials and Methods: A Questionnaire Performa was prepared about dental burs how to use ,
sterilized and disposed of them. in addition to information about doctors to determine the relationship between scientific information of doctors with their experience and Specialty. questionnaire was distributed on a group of dentists in the Syrian coast were chosen at random( N = 100) and during the period of almost two months only ,and then the answers analyzed statistically. Results: The response rate was 76%. However, the results of the current study showed that there was no difference between specialists and non-specialists in the level of information available about the burs and use it, as there was no difference between males and females in the level of information On the other hand, the result showed an inverse relationship between age and the level of information (P˂0.05). only 52% of the dentists were able to determine the appropriate composite finishing bur.
Conclusion: The level of the information of dentists in the Syrian coast was considered acceptable Nevertheless, there is an urgent need to increase the wright information of dentists around the burs and their use and also their sterilize.
The need to repair dentoalveolar atrophy and bone defects has resulted in
developing techniques and sources of graft materials، and the use of autogenous bone grafts continues to
represent the ‘gold standard’ in reconstructive surgery of the oral a
nd maxillofacial region.
This study aims to assessment the complications of autogenous bone harvesting from retromolar region of
mandible by trephine burs.
